Fuse.



No. 82l,883. PATENTED MAY 29, 1906.

F. I. DU PONT. FUSE.

APPLICATION FILED JAN. 5, 1906.

i To all whom it may concern: p I Be it known that I, FRANCIS I. DU Pour, a

UNITED STATES PATENT OFFICE.

FRANCIS I. DU PONT, OF WILMINGTON, DELAWARE, ASSIGNOR TO THE E. I. DU PONT DE NEMOURS POWDER COMPANY, OF WILMINGTON, DELAWARE, A CORPORATION OF NEW JERSEY.

FUSE.

citizen of the United States, residing at Wilmington, county of Newcastle, and State of Delaware, have invented a new and useful Improvement in Fuses, of which the following is a full, clear, and exact description, reference being had to thevaccompanying drawings, which form a part of this specification. The object of my invention is to provide means whereby a plurality of blasts may be fired from the same electric circuit at differ ent times'i. e., non-simultaneousl Thus, for instance, it is often desirable t at a certain number of blasts shall be fired at as nearly as possible simultaneously at a 'iven time after a certain number of other b asts. The difficulty in doing this with a single pair of wires is that when the first set of blasts is exploded or set off the wires are as a rule destroyed, so that the next set cannot be set off by an electric current conducted by those wires.

My invention consists in providin what I call a delay-action time-fuse, w 'ch, although fired simultaneously with the other blasts, will not. act until a predetermined period thereafter. these delay time-fuses, which I will hereinafter fully describe, so that a certain number of panying drawing.

the blasts may be exploded at one time and a certain number at another time, and so on.

I will now describe the improved delay time-fuse, which is illustrated in the accom- In the drawing, A is a 0.0 per case similar :to those usuall used.. In t '5 case the portion B is fille withfulminate of mercury. Above this fulminate of mercury is placed a pressed piece of any of the smokeless-powder compositions now in use or modlficatlons of them. Above this pressed-' owder piece or block is a small charge of b ack powder D. In this charge of black powder extends the ignition-wire E, which is connected with the usual fine platinum circuit E used for this purpose. The wires E are connected to the wires H from source of current-supply J.

K is the switch for closing the circuit.

13 represents any kind of fillingfor mstance, paraffin. b

In operation the electric current heats the platinum part E red-hot, ignitmg the pow- Specification of Letters Patent; Application filed January 5, 1906. Serial No. 294,719.

1 three sets of fuses-two in each set.

In practice I can so arrange Patented May 29, 1906.

der D, which in turn ignites the upper surface of the block of smokeless powder 0." The length of time which elapses between the ignition of the upper surface of the block O and thicknesses I can 'produce the explosion of difierent fuses at different times, although they will all be initially fired at the same time. Thus in the drawing I have shown v Fuses 1 and 2 have a less thickness of block than have fuses 3 and 4, which in turn have a less thickness of block than fuses and 6. Thus with this arrangement the fuses 1 and 2 will first explode, and then a time thereafter, based upon the difference in thickness between the block 0 in 1 and 2 and in 3 and 4, the fuses 3 and 4 will explode, and, fina'll a time thereafter, dependent upon the di erence in thickness in 5 and 6 between that in 3 and 4, fuses 5 and 6 will explode.

including all of said fuses.

2. In combination, a plurality of fuses, or I sets of fuses,'each fuse comprlsing a casing containing fulminate of mercury, ablock of smokeless powder above said mercury, said block in the fuses, or sets of fuses, being of different thicknesses and black powder above said block, and said electric circuit including 7 all of. said fuses.

' 3. A fuse, comprising a casing, containing fulminate of mercury,.a block of smokeless powder above said mercury. 1

4. A fuse comprising a casing, containing fulminate of mercury, a block of smokelessowder above said mercury, and black powder above said block.

5. A fuse comprising a casing, containing fulminate of mercury, a block of smokeless powder above said mercury, said block being of predetermined thickness.

6. A fuse comprising a casing, containing fulminate of mercury, a block of smokeless powder above said mercury, and black powder above said block, said block being of predetermined thickness.

7. A plurality of fuses, or sets of fuses, each fuse comprising a casing containing fulminate of mercury, a body of smokeless powder above said mercury, the thickness of the body of smokeless powder varying in the different fuses, or sets of fuses, and an electric circuit including all said fuses.

8. In combination, a plurality of fuses, or sets of fuses, each fuse comprising a casing containing ful minate of mercury, a body of smokeless powder above said mercury, said body in the fuses, or sets of fuses, being of different thicknesses, a black powder above said smokeless owder, and an electric cir cuit including al of said fuses.

9. A fuse, comprising a casing containing fulminate of mercury, a body of smokeless powder above said mercury.

10. A fuse, comprising a casing containing fulminate of mercury, a body of smokeless owder above said mercury, and black powier above said smokeless powder.

11. Afuse, comprising a casing containing fulminate of. mercury, a body of smokeless said body of predetermined smokeless powder being 0 thickness.

. 12. A fuse, comprising a casing containing fulminate of mercury, a body of smokeless powder above said mercury, and black powder above said smokeless powder, said body of smokeless powder being of predetermined thickness.

In testimony of which invention I have hereunto set my hand, at Wilmington, on this 30th day ofl ecem'ber, 1905 FRANGIS I. DU FONT.

powder above said mercury Witnesses:

R. J. Corrie, I CLIFFORD V. MANNERING. 

